The package offers a simple notation for pretty complex tables (to
Michael J. Ferguson’s credit). With PostScript, the
package allows shaded/coloured tables, diagonal rules, etc. The
package is supposed to work with both Plain and LaTeX.
An AWK converter from ASCII semigraphic tables to TAP notation is
included.

The authors are Bogusław Jackowski, Piotr Pianowski and P. Strzelczyk.